On 24/10/2014 13:59, Thomas Petazzoni wrote:
> This commit adds the implementation of ->suspend() and ->resume()
> platform_driver hooks in order to save and restore the state of the
> GPIO configuration. In order to achieve that, additional fields are
> added to the mvebu_gpio_chip structure.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
> Cc: Alexandre Courbot <gnurou@xxxxxxxxx>
> Cc: linux-gpio@xxxxxxxxxxxxxxx
> ---
> drivers/gpio/gpio-mvebu.c | 99 +++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 99 insertions(+)
>
> diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
> index 418e386..dd5545c 100644
> --- a/drivers/gpio/gpio-mvebu.c
> +++ b/drivers/gpio/gpio-mvebu.c
> @@ -83,6 +83,14 @@ struct mvebu_gpio_chip {
> int irqbase;
> struct irq_domain *domain;
> int soc_variant;
> +
> + /* Used to preserve GPIO registers accross suspend/resume */
across
> + u32 out_reg;
> + u32 io_conf_reg;
> + u32 blink_en_reg;
> + u32 in_pol_reg;
> + u32 edge_mask_regs[4];
> + u32 level_mask_regs[4];
> };
>
> /*
> @@ -554,6 +562,93 @@ static const struct of_device_id mvebu_gpio_of_match[] = {
> };
> MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
>
> +static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> + struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
> + int i;
> +
> + mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
> + mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
> + mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
> + mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
> +
> + switch (mvchip->soc_variant) {
> + case MVEBU_GPIO_SOC_VARIANT_ORION:
> + mvchip->edge_mask_regs[0] =
> + readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
> + mvchip->level_mask_regs[0] =
> + readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
> + break;
> + case MVEBU_GPIO_SOC_VARIANT_MV78200:
> + for (i = 0; i < 2; i++) {
> + mvchip->edge_mask_regs[i] =
> + readl(mvchip->membase +
> + GPIO_EDGE_MASK_MV78200_OFF(i));
> + mvchip->level_mask_regs[i] =
> + readl(mvchip->membase +
> + GPIO_LEVEL_MASK_MV78200_OFF(i));
> + }
> + break;
I don't know if the suspend is supported on this platform but as we were
on the road to remove this platform I don't know it it worth testing it unless
some interested users show up.
I didn't tested it on a mv782xx platform but the patch looks correct:
Reviewed-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Thanks,
Gregory
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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